Double winding for horological movements



Dec. 9, 1952 MEYER 2,620,619

DOUBLE WINDING FOR HOROLOGICAL. MOVEMENTS Filed April 2, 1948 2 SHEETS-SHEET 1 l 7' a //1 1a 3 /4 Y// fl Dec. 9, 1952 F. MEYER 2,620,619 DOUBLE WINDING FOR HOROLOGICAL MOVEMENTS Filed April 2, 1948 2 SHEETS-SHEET 2 971-9-974-- '//A Wm Patented Dec. 9, 19.52

.DQUBLE W ND NG FOR Q QLOG CA -MOV-EMENTS Friedrich Meyer; Grenchen, Switzerland, assig-nor -to-Fe1sa -S. A,, Grenchen, Switzerland ApplicationAprihZ, 1948, Serial No. 18,604 lnswitzerland July 23, 1947 11 Claims. .1

Th s inv ntion r la e t horological movements.

Wat s w th double w ndi g a e wel rknown in the art. The one windingmay be electrical, t o e m ni al, o inth aseo se -.winding wrist watches, the onemayh be a self-winding mechanism and the other behand operated.

The invention relates to the kind of double winding in horologieal movementswith, a mainspring ina barrel, in which the one device-does not work when the other is..i. wi d n o er tion.

Object of the i vent onu to fi teth ,cor a or centerof the barrel two pawl wheels the pawls of which engage internal toothings of winding wheels loosely rotating coaxially to the barrel axis, the pawls bearing against the top of the teeth of the internal toothings.

Other objects and featureswill be. apparent as ,double winding ,for

the following description proceeds, referencebeing had to the accompanying drawing showing one example of the invention. .It is,-.however, understood that this inventionis not, necessarily limited thereto, as various changes intheshape, proportions and general assemblage. ofthe parts may be resorted to without departing from the principle of the invention or sacrificingany of its advantages. ,In the drawings:

Fig. 1 is a section along the axis ,ofuthe barrel arbor,

,Fig. 2 is a plan .view of parts belongingto the winding mechanism, some of these portions being partly broken ,away.

Fig. 3 is an axiale ionofth pa W ls, and

Fig. 4 is a planview of .thesewheels.

The barrel arbor 2 is tightly fixed to the plate I. The barrel center or core ,3 is rotatably mounted on this arbor .2. The barrel itself is designated by 4. The upper end of the core .3 is formed as a square II to which the hubs! and}! of ,thepawl wheels 5 and Garefixed. The pawls ofthesewheelsform long arc-shaped resilient parts 9 .and lflextendingoverabout 180 of the Wheels (-Fig. 4). These pawls -9 andrtfi end in fingers II and I2 directed towardsthe outside.

The ifins I of th :paw wh e .5 enga e the gaps of an internal toothing -13 provided on the circumferential wall of a recess ofa winding wheel l3 loosely rotatable on the barrelpcenter or core 3 and supported on a shoulder IA of this core.

The finger :IZ forming -,the free :end of the resilient pawl V I0 I in -a similar manner engages thergaps of an internaltoothing I 5-;provided on the circumferential wall of a second winding wheel I5. "Thislatter wheel is rotatably held-by means of a pierced screw I6 screwed'to'the core-3. This screw I6 serves at the same time as abearing'bush for the core 3. The winding wheel -I;5 engages a pinion H of a winding mechanism, while the Winding wheel I 3 meshes with the pinion [8 of a second winding mechanism.

his to be noted that the c'enter of 'the outer circular rim of the pawls 9 and I0-lies in =-the axis of the barrel andthat its-radiusis equal'or substantially equal tothat ofthe top'circle of-the internal toothing intothe gaps-of which-the pawl enters. The pawls may thus be very-thin and resilient. When, unde'rthepressure exerted on them on winding, theynndergo'bucklingstresses, they are guided by the top of I the teeth against which they are then supported. l-l oweverfif the fingers, on an idle movementof the pawlwheels trail over the teeth of the correspondinginternal toothings of the winding wheels,-they o'fier but a. slight resistance to this trailingmoveinent-which is not sufiicient to take alongthewinding wheel in question.

The mains-pring not shown in the barrel is wound up-inthe direction of 'the arrow'n. If

this is done by 'meansof the-pinion IBan'dthe winding wheel I 3, the movement isimparted'jao the core 3 by the pawl wheelfiwhose finger -I=I engages the gaps of I the internal -toothing |f3f. On this occasion the pawl wheel Sis taken along and its finger IZ trails easily-over theteethof the toothing I5 without taking along the wheel I5. If, on the contrary,-themainspringais-wound up by the pinion I'Idriving-the winding wheel I5, the finger I2 engaged-while theifingeratI trails over the teeth. of the wheel. t3.

While I have described and illustrated oneeembodiment of my invention, I-doc-not .wish;-to-..un necessarily limit the scope of thisinvention, but reserve the right to make such modifications. and rearrangements of the several parts as. may come within the purview of the,ac,companym claims.

What Iclaim is:

.l- In a do Wind nsmwh nis iiq 4 cmlogical movements, a fixedhparthaibarrel, rear mou ed on sa fixed partta bar e mount 19. a rr a o windin whe l ,meu ted :en said ar e a -'andeprovide ;-.wit. annnl rly a r n d tern l t e h, p whwheel moun eden said barr e bwhav ns r silient-paw ;.memher e a n aidm e na -teet th e t nedsee said pawl ber e ne qeeted 9s. t the crests of i in r a -t t ma low, s idraw member o b a a a ns th :e est p isai .-i

rna teeth wh n und rsoi shuek ing str. se

each of said pawl wheels and'pawl member thereof consisting of one, fiat piece of thin, sheet material.

2. In a double winding mechanism for horological movements, a fixed part, a' barrel arbor mounted on said fixed part, a barrel mounted on said barrel arbor, winding wheels pivotally mounted on said barrel arbor and provided with annular internal teeth, pawl wheels coupled with said barrel arbor, and arranged in the interior of said winding wheels, and having resilient pawl members engaging said internal teeth, the outer edge of said pawl members lying close to the crests of said internal teeth to allow said pawl members to bear against the crests of said internal teeth when undergoing buckling stresses, each of said pawl wheels and pawl member there of consisting of one, fiat piece of thin, sheet material.

3. In a double winding mechanism for horological movements, a fixed part, a barrel arbor mounted on said fixed part, a barrel mounted on said barrel arbor, winding wheels pivotally mounted on said barrel arbor and provided with internal annular teeth, pawl wheels coupled with said barrel arbor, arranged in the interior of said winding wheels, and having resilient, elongated pawl members provided with projections engaging said internal teeth, said pawl members being located close to the crests of said internal toothings to allow said pawl members to bear against the crests of said internal teeth when undergoing buckling stresses, each of said pawl wheels and pawl member thereof consisting of one, fiat piece of thin, sheet material.

4. In a double winding mechanism for horological movements, a fixed part, a barrel arbor mounted on said fixed part, a barrel mounted on said barrel arbor, winding wheels mounted on said barrel arbor and provided with internal annular teeth, pawl wheels mounted on said barrel arbor, arranged in the interior of said winding wheels, and having resilient, elongated pawl members extending over an outer part the pawl wheels and having an outer arcuate edge which is substantially concentric with said winding wheels, said pawl members being provided with projections engaging said internal teeth, on the radius of the outer arcuate edge of said pawl members being substantially equal to the radius of the circle passing through the crests of said internal teeth to allow said pawl members to bear against the crests of said internal teeth when undergoing buckling stresses, each of said pawl wheels and pawl member thereof consisting of one, fiat piece of thin, sheet material.

5. In a double winding mechanism for horological movements, a fixed part, a barrel arbor mounted in said fixed part, a barrel mounted on said barrel arbor, winding wheels pivotally mounted on said barrel arbor and provided with internal teeth, pawl wheels coupled with said barrel arbor, arranged in the interior of said winding wheels, and having arc-shaped resilient pawl members extending over a portion of the circumference of the pawl wheels with their outer circumference substantially concentric with said winding wheels, said pawl members being provided with projections to cooperate with said internal teeth, and the radius of the outer circumference of said pawl members being substantially equal to the radius of the circle passing through the crests of said internal teeth to allow said pawl members to bear against the crests of said internal teeth on undergoing buckling stresses, each of said pawl wheels and pawl member thereof consisting of one, flat piece of thin, sheet material.

6. In a double winding mechanism for horological movements, a fixed part, a barrel arbor mounted on said fixed part, a barrel pivotally mounted on said barrel arbor, winding wheels pivotally mounted on said barrel arbor and provided with internal and external annular teeth, winding pinions engaging the external teeth of said winding wheels, pawl wheels arranged in the interior of said winding wheels, having hubs coupled with said barrel arbor, and arc-shaped resilient pawl members integral with the pawl Wheel hubs and extending over a portion of the circumference of the pawl wheels with their outer circumference substantially concentric with said winding wheels, and projections provided on the free end of said pawl members, directed away from the center of the pawl wheels to cooperate with said internal teeth, the radius of the outer circumference of said pawl members being substantially equal to the radius of the circle passing through the crests of said internal teeth to allow said pawl members to bear against the crests of said internal teeth when undergoing buckling stresses, each of said pawl wheels and pawl member thereof consisting of one, fiat piece of thin, sheet material.

7. In a double winding mechanism for horological movements, a fixed part, a barrel arbor fixed to said fixed part, a barrel pivotally mounted on said barrel arbor and comprising a core, winding wheels pivotally mounted on said core and provided with internal and external annular teeth, winding pinions engaging the external teeth of said winding wheels, pawl wheels arranged in the interior of said winding wheels, having hubs coupled with said core, and arcshaped resilient pawl members integral with the pawl wheel hubs and extending over about of the circumference of the pawl wheels with their outer circumference substantially concentric with said winding wheels, and fingers provided on the free end of said pawl members and being directed away from the center of the pawl wheels to cooperate with said internal teeth, the radius of the outer circumference of said pawl members being substantially equal to the radius of the circle passing through the crests of said internal teeth to allow said pawl members to bear against the crests of said internal teeth when undergoing buckling stresses, each of said pawl wheels and pawl member thereof consisting of one, fiat piece of thin, sheet material.

8. In a double winding mechanism for horological movements, a fixed part, a barrel arbor fixed to said fixed part, a barrel pivotally mounted on said barrel arbor and comprising a core having a square portion, winding wheels pivotally mounted on said core and provided with internal and external annular teeth, winding pinions engaging the external teeth of said winding wheels, pawl wheels arranged in the interior of said winding wheels, having hubs with square holes fitting said square portion, and arc-shaped resilient pawl members integral with the pawl wheel hubs and extending over about 180 of the circumference of the pawl wheels with their outer circumference substantially concentric with said winding wheels, and fingers provided on the free end of said pawl members and being directed away from the center of the pawl wheels to cooperate with said internal teeth, the radius of the outer circumference of said pawl members being substantially equal to the radius of the circle passing through the crests of said internal teeth to allow said pawl members to bear against the crests of said internal teeth when undergoing buckling stresses, each of said pawl wheels and pawl member thereof consisting of one, fiat piece of thin, sheet material.

9. In a winding mechanism for horological movements having a rotatable barrel arbor, in combination, a pair of rotatably mounted winding wheels concentrically located with respect to each other and each having an outer face located closely adjacent to the other winding wheel, each of said winding wheels being formed with a substantially circular recess in said outer face thereof and being provided with a plurality of internal, annular teeth located about said recess;

and a pair of pawl wheels operatively connected to said barrel arbor for rotating the same and each having an arcuate, springy pawl member having a free end respectively engaging the internal teeth on one of said winding wheels and each pawl member being respectively located adjacent to said internal teeth of one of said winding wheels so as to bear against the same when said pawl members are subject to buckling forces, said pawl wheels and their pawl member each being of a substantially smaller thickness than said winding wheels and each being respectively located almost completely within said recesses and said pawl wheels and pawl members thereof bearing against each other to mutually reinforce each other against buckling.

10. In a winding mechanism for horological movements having a rotatable barrel arbor, in combination, a pair of winding wheels concentrically mounted closely adjacent to each other for turning movement about the axis of the barrel arbor and each having a side surface facing the other winding wheel, each of said side surfaces of said winding wheels being formed with a substantially circular recess and being provided with a plurality of internal, annularly arranged teeth located about said recess, said recesses facing each other to form between said winding wheels a chamber larger than the space between said winding wheels; and a pair of one-piece, fiat, sheet material pawl wheels located against each other respectively within said recesses and substantially filling the chamber formed by the same, each pawl wheel being operatively comiected to the barrel arbor for turning the same and having an arcuate springy pawl member provided with a free end engaging the teeth about the recess in which the respective pawl wheel is located, whereby said pawl members mutually reinforce each other against buckling forces.

11. In a winding mechanism as defined in claim 10, each of said pawl wheels having a cen tral hub portion which is joined to the barrel arbor, and each of said arcuate springy pawl members having a width which is substantially greater than the thickness thereof.

FRIEDRICH MEYER.

REFERENCES CITED The following references are of record in the iile of this patent:

FOREIGN PATENTS Number Country Date 23,200 Great Britain Dec. 19, 1900 592,986 Germany Feb. 16, 1934 

